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By default, Azure AI Search automatically encrypts data at restwith service-managed keys. If we need more protection, we can supplement the dfault encryption woth with another layer of encryption using keys that we can create and manage in Azure Key Vault (Encrypt data using customer-managed keys - Azure AI Search | Microsoft Learn).
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- Move a search service across regions - Azure AI Search | Microsoft Learn, Encrypt data using customer-managed keys - Azure AI Search | Microsoft Learn, Azure security baseline for Cognitive Services | Microsoft Learn
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